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Full text of "The manufacture and properties of iron and steel"

INFLUENCE OP CERTAIN" ELEMENTS ON STEEL.
373
suit being shown in Table XVII-P.   In the last column is given what may be called the base, or the strength of the iron and phos-
FIG. 2.
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ULTIMATE STRENGTH IN POUNDS PER SQUARE INCH AFTER DEDUCTIN EFFECT OF CARBON AND MANGANESE j ]  j* & :	EFFECT OF PHOSPHORUS ON ACID STEEL																<^c	&*		
																/	0			
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	K                    0.03                   0.04                    0.05                    0.08                   O.I																			
PHOSPHORUS, PER CENT
FIG. XVII-B.BPFEOT OF PHOSPHORUS ON ACID STEEL.
phorus after allowing for carbon and manganese; this last column is plotted in Fig. XVII-B. By combining the groups so as to rectify the lines by the method used in Table XVII-0, it will be found that, in the line representing heats ranging between 0.075 and 0.224 per cent, of carbon, the phosphorus has a value of about 860 Ib. for each 0.01 per cent.; in the range from 0.325 to 0.374 per cent, of carbon, the value is 940 Ib.; between 0.375 and 0.524 per cent, of carbon it is 1290 pounds. This would indicate that, as the percentage of carbon increases, the effect of each unit of phosphorus increases, but the difference is so unimportant and the margin of cer-